Drug Metabolism

Drug Metabolism

• Drug metabolism involves the biochemical modification of drugs, primarily through enzymatic processes, to facilitate their excretion from the body.

1. Biotransformation

   • Drugs can undergo transformation through various pathways, resulting in:
     • Inactive Compounds: Metabolites ready for excretion.
     • Active Metabolites: Compounds with their own therapeutic or toxic effects.
     • Prodrugs: Inactive forms that become active only after metabolic conversion.

2. Metabolic Pathways

   1. Cytochrome P450 Enzymes

      • A key family of enzymes involved in drug metabolism. Individual variability in these enzymes can significantly influence drug response.

   2. Phase I Reactions

      • Involve oxidation, reduction, or hydrolysis to increase polarity of the compound, preparing it for further modification or excretion.

   3. Phase II Reactions

      • Conjugation of Phase I metabolites with larger molecules (e.g., glucuronic acid), making them more water-soluble for easier excretion.

3. Metabolite Profiling

   • Techniques such as mass spectrometry help in identifying and quantifying drug metabolites, aiding in the prediction of potential drug interactions and side effects.

It is crucial in determining a drug’s duration of action, potential interactions, and side effects, all of which influence therapeutic effectiveness and safety.

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